Roll Depot Tools from 39d317835bd0 to 8b4eeffd4628 (1 revision)

https://chromium.googlesource.com/chromium/tools/depot_tools.git/+log/39d317835bd0..8b4eeffd4628

2020-07-20 dmcardle@chromium.org git-cl: Fix "git cl tree" issues with Python 3.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/depot-tools-chromium-autoroll
Please CC ajp@google.com,apolito@google.com,ehmaldonado@google.com,sokcevic@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: None
Tbr: ajp@google.com,apolito@google.com,ehmaldonado@google.com,sokcevic@google.com
Change-Id: Ie8290d5733778d3809fe90624c2ed7c29e35600b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307637Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#790015}

DEPS

@@ -895,7 +895,7 @@ deps = {
   },
 
   'src/third_party/depot_tools':
-    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '39d317835bd0c3eeeda24e394d9e58120c008ef1',
+    Var('chromium_git') + '/chromium/tools/depot_tools.git' + '@' + '8b4eeffd4628a54e47ccd44e7a3f426b3218bad2',
 
   'src/third_party/devtools-frontend/src':
     Var('chromium_git') + '/devtools/devtools-frontend' + '@' + Var('devtools_frontend_revision'),